Collaboration Messaging Component

This directory contains the public API for the Collaboration Messaging component.

Overview

The Collaboration Messaging component is a central service for managing and dispatching collaboration-related messages to the UI. It acts as a bridge between various backend services and the UI, translating backend events into user-facing messages and notifications.

The service is responsible for:

• Processing events from different collaboration-related services.
• Storing and managing the lifecycle of persistent and instant messages.
• Providing APIs for the UI to query for messages and activity logs.
• Notifying observers of changes in message states.

This service depends on and provides messages for other services like TabGroupSyncService and DataSharingService.

Key Concepts

The service distinguishes between two main types of messages:

• PersistentMessage: Represents an ongoing UI affordance, such as a "dirty" state on a tab or a chip on a tab. These messages are managed via the PersistentMessageObserver.
• InstantMessage: Represents a one-off, immediate notification, such as a toast when a user joins a collaboration. These messages are handled by the InstantMessageDelegate.

The service also provides an Activity Log feature, which allows the UI to query for a list of recent activities within a collaboration.